Clutch mechanism for bar machines



fatented Dec. 1928.

uNiTEDLsTAT-Es j 're-assai PArENToFFiCs.

LEEl A. FRAKYER, OF COLUMBUS,HOHIO.

CLUTCH MECHANISM FOR BAR- MACI-IIN ES.

Application med March 23,1925. serial No. 17,569. l I

The invention relates more particularly to the type of machine shown and described in Letters Patent of the United States issued to me April 81, 1925, No. 1,531,280, in whichl the nut blank or other device is drilled and cut from a bar of fed and rotated stock; and the invention has for its object the provision of an improved centrifugal chuckvmeans for holding the stock, and means cooperating l therewith for feeding the. stock and holding it from rotation in respect ofthe feeding means. It also includes improved means for releasing the bar feeding means from the bar. Other objects can be gathered from the y disclosure herein.

The invention is embodied in theexample herein shown and describedthe features of novelty being finally claimed.

.In the accompanying drawing- Figure 1 is a central longitudinal section-` al view illustrating the improvement as applied with a part broken out, and

Fig. 2 is a cross section on the line II-II Figl.v

In the views the character 16 designates the feed tube for the stock bar (shown at 14) said tube having threaded to it at its forward end a removable section 16a slit to form bentv spring fingers for frictionally engaging the faces of the stock bar with sufficient firmness to Vfeed the bar forward when the` tube is movedin that direct-ion. j The section'la is maderemovable so that another section of different size can be substituted for it. Screw threaded into the feed tube at its rear end `is a release tube 17 of suioient length to permit it by -turning, the wheel 17 a with a suitable wrenchV or pin to be advanced under the spring fingers of the section 16a to lift them from the stock bar. The threading of the release tube should be made ample' to liftl the spring fingers sufficiently to permit easy movement or removal of the stock bar or remnant thereof when desired. The feed tube to-y and reciproca-ted the latter being effected by means includingv a fork lever 20 straddling the feed tube and having its fork arm further forked to engage opposite trunnions on a yoke ring 21 seatedin an annular groove in the rear end of the feed tube. The ring 21 permits the feed tube to be rotated for turn` ing the bar in the cutting operation'. The fork lever 20 is oscillated'to feed the stock bar by suitable means such as shown in my' said former application for patent and the etent gether with the release tube are both rotated f spindle`25. In the present'ins'tance the collet 24 is provided with inwardly projecting lugs v 24n that extend between thefbar gripping,

spring fingers of the movable section 16'and insure the rotation of the feed and releasey tubes withthe chuck sleeve 23. `The work spindle, chuc r sleeve and jaws, feed and release tubes are all rotatable in suitable bearings at 26 and :26a by power applied tov a large spur gear 80.

To automatically move and hold the'chuck sleeve and aws yaxially with reference to the work spindle and for the purpose of compressing the chuck ljaws to grip the stock'bar 'Y I employ centrifugal elements including weights 27l having arms 28 provided with lugs k28a said arms being pivote'dv` on walls 29 extending from the large gear 30.

Pivoted on the walls 29 are-levers 31 having short lugs 31a and curved outerportions within which work the ends of the arms 2S so vthat the moment the weights y27 move outward under centrifugal action or gravity the lugs 28Tpress said levers J31 inthatdirection Y which causes the lugs 31"L tomove the chuck sleeve in the direction tok close the chuck jaws on the stock bar. At the point where the lugs 31' actua-te the chuck sleeve the latter is provided with a bearing ring of hard metal 32. The arms 28 are unconnected with the levers 81 so that gravity affects the weight on the lower centrifugal element and increases the chucking pressure, and the effect of gravity above the 'center does not have any diminishj ing or offsetting eifect on the chucking force.

The work spindle has feathered on it -a bearing rin 33 pressed by springs 34 carried in a ho low orjsocketed ring 35 adjustably-threaded onithe rear end of the chuck sleeve 25, so that the pressure of the ring can be regulated to compensate'for expansion Y vand contraction or take up wear.

The chuck colletl 24 is released from the stock bar and against the pressure of the Lll) centrifugal Weight by suitable power actuating a pivoted yoke 88 engaging opposite trunnions on a ring 89, these parts being connected With the rear end of the `chuck sleevel. ln a bar feeding machine, the com-v bination, of bar feeding means, a chuck tube and chuck and rotating means therefor, a lever pivoted With the rotating means and engaging the chucliing member and a centrifugal element to act'on said lever to cause the chucking of the fed bar, said cen trifugal element being movable independently of said lever.

2. In a bar feeding machine, the combina` tion., of bar feeding means, a chuck tube and chuck tube and Chuck and rotating means therefor, a lever pivoted With the rotating means and engaging the cliucking member anda centrifugal element to act on said lever to chuck the fed bar, lsaid centrifugal element being movable independently of said lever-and means for releasing said chucling means notwithstanding the operation of the centrifugal element.'

3. In a bar feeding mechanism, the combination of bar chucking means, bar feeding means including a feed tube movable longitudinally with reference to the chucling means, said feed tube carrying spring fingers to engage the bar andmeaiis whereby said spring lingers may be released from the bar at will, and means connecting the chucking means With the feed tube to `cause the latter yto rotate with the chucking means.

4. In a bar feeding machine, the combination, of a rotary bar chuclriiig means, bar

feed-ing means including a feed tube and a tion, of a longitudinally movable and rotata ble bar chucking means, bar feeding means including a feed tube and a? feed tube releasing means movable longitudinally with reference to each other and to the chucling means, means connecting the cliueling means with the feed tube to cause the latter to rotate with the chucking means, andmeans for operating the chuclring and feeding means independently of each other. v t

6. In a bar feeding machine, the combination of bar chucking .means and bar feeding means, the latter consistingof va tube having spring lingers for engaging the bar, and releasing means forsaid fingers consisting of a tube longitudinally movable With reference to said bar feeding means;

7. In a bar .feeding machine the combination of bar chucling means and bar feeding means, the latter consisting of a tube having spring lingers for engagingy the bar, and releasing means fer said fingers consisting of a tubelongitudinally movable With reference to said bai' Vfeeding means and lugs on the cliucking means engaging said spring fingers to cause the feeding and releasing means to rotate lwith the chucking means.

8. In a bar feedingy machine the combina tion' of bar chucking means and bar feeding means, the latter consisting of a tube having spring vfingers for enga-ging the bar, and releasing means for said lingers consistingy of a i tube connected with .the bar feeding 4means and longitudinally movable With reference to said bar feeding means.

LEE A., trinrrnn.V 

